Why don't you let us know what forums you were considering starting an OT thread in? That would make it much easier for us to let you know whether or not you can start one.

As far as how they work, OT threads are Off Topic threads. They allow the users of a specific forum to gather and get to know each other while discussing whatever they want. Within the PbNation rules, of course.

Thank you for taking the time to ask, rather than creating one on your own. Please let us know if you have any more questions.